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AT&T is warning iPhone 18 Pro Max customers to update their devices immediately as an ongoing cellular issue could prevent affected phones from making calls, sending texts, using mobile data, or even reaching 911. The carrier
AT&T warns that some iPhone 18 Pro Max devices may lose cellular service, including 911 access. Users report that iOS 27.0.1 has not consistently restored connectivity.
iPhone 18 Pro Max AT&T call failures may be fixed by iOS 27.0.1, but some users report mixed results after updating.